Add TicketType model with validations and fix dropdown menu

- Create TicketType model with Party association and Ticket relationship
- Add comprehensive validations for name, description, pricing, and date ranges
- Generate migration for ticket_types table with all required fields
- Add Alpine.js import to fix dropdown menu functionality
- Update ticket model with validations for qr_code, price, and status

app/models/ticket.rb

@@ -0,0 +1,8 @@
+class Ticket < ApplicationRecord
+  # Validations
+  validates :qr_code, presence: true, uniqueness: true
+  validates :party_id, presence: true
+  validates :user_id, presence: true
+  validates :price_cents, presence: true, numericality: { greater_than: 0 }
+  validates :status, presence: true, inclusion: { in: %w[active used expired refunded] }
+end